[EROS-Arch] Kernel loading

[Charles Landau]

I think there is some inconsistent commentary:

http://www.eros-os.org/eros-src/sys/eros/i486/target-asm.h defines
KERNPBASE as 0x00101000.

http://www.eros-os.org/eros-src/sys/arch/i486/kernel/lostart.S#30 says
the kernel is at 0x1000, but this may change to 0x1001000, as the kernel
is growing.

(1) None of these numbers matches. I suspect lostart.S needs updating.

(2) "as the kernel is growing" - I don't understand how moving it up
alleviates this.

(3) It would be helpful to have the layout of physical memory documented
somewhere.